package com.c2b.algorithm.leetcode.jzoffer;

/**
 * <a href="https://leetcode.cn/problems/fan-zhuan-dan-ci-shun-xu-lcof/"> 翻转单词顺序</a>
 * <p>输入一个英文句子，翻转句子中单词的顺序，但单词内字符的顺序不变。为简单起见，标点符号和普通字母一样处理。<br>
 * 例如输入字符串"I am a student. "，则输出"student. a am I"。</p>
 * <pre>
 * 示例 1：
 *      输入: "the sky is blue"
 *      输出: "blue is sky the"
 * 示例 2：
 *      输入: "  hello world!  "
 *      输出: "world! hello"
 *      解释: 输入字符串可以在前面或者后面包含多余的空格，但是反转后的字符不能包括。
 * 示例 3：
 *      输入: "a good   example"
 *      输出: "example good a"
 *      解释: 如果两个单词间有多余的空格，将反转后单词间的空格减少到只含一个。
 * </pre>
 *
 * @author c2b
 * @since 2023/4/6 18:44
 */
public class JzOffer0058ReverseWords_I {

    public String reverseWords(String s) {
        if (s == null) {
            return null;
        }
        // 去除首尾空格
        String[] strings = s.trim().split(" ");
        StringBuilder stringBuilder = new StringBuilder();
        for (int currentIndex = strings.length - 1; currentIndex >= 0; --currentIndex) {
            if (strings[currentIndex].equals("")) {
                continue;
            }
            stringBuilder.append(strings[currentIndex]).append(currentIndex == 0 ? "" : " ");
        }
        return stringBuilder.toString();
    }

    public static void main(String[] args) {
        JzOffer0058ReverseWords_I jzOffer0058ReverseWords_i = new JzOffer0058ReverseWords_I();
        //System.out.println(jzOffer0058ReverseWords_i.reverseWords("the sky is blue").equals("blue is sky the"));
        //System.out.println(jzOffer0058ReverseWords_i.reverseWords("the sky is blue"));
        //System.out.println(jzOffer0058ReverseWords_i.reverseWords("  hello world!  ").equals("world! hello"));
        //System.out.println(jzOffer0058ReverseWords_i.reverseWords("  hello world!  "));
        System.out.println(jzOffer0058ReverseWords_i.reverseWords("a good   example").equals("example good a"));
        System.out.println(jzOffer0058ReverseWords_i.reverseWords("a good   example"));
    }
}
